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Problem 123 Medium Difficulty

A $2.6-\mathrm{L}$ sample of water contains $192 \mu \mathrm{g}$ of lead. Does this concentration of lead exceed the safety limit of 0.050 ppm of lead per liter of drinking water? [Hint: $1 \mu \mathrm{g}=1 \times 10^{-6} \mathrm{g}$. Parts per million (ppm) is defined as (mass of component/mass of solution) $\left.\times 10^{6} .\right]$

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Physical Properties of Solutions

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Video Transcript

to compute parts per 1,000,000 in Mass. All we have to do is to take the mass off the Salyut and divide by the mass off solvent G in multiplied by a 1,000,000. That's that's why it's called parts per 1,000,000. Uh, both have to be in same units because P. P. M. Is, um, unit lists. It has no dimension came. All right, so let's do this for the lead. We know that the concentration or the massive lad in the same place 192 micrograms k in microgram is the equivalent off 10 to the minus six grams. So we can ride 192 times 10 to the minus six grams. Okay. And that's gonna be divided by the mass off water. All right, then we don't have the mass of water. We actually have the volume, so we have the volume of water, which is 2.6 litres. But remember that for pure water or very diluted solutions, as is, it's this case. The one litre of water is approximately one kilogram. So we can say that this is 2.6 kilograms and we want this to be in grams. So we can also say that this is 2600 grips cake. So this is the number that we gonna put down here and we multiply this by 10 to the six. All right, this is very simple. You compute that you will find that this is a cool I want the 0.74 p p. M. Right, which is greater than the tolerance.

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Watch More Solved Questions in Chapter 12

Video Transcript

Raymond Chang, Kenneth A. Goldsby

Chemistry

Stephanie Castillo

Allea Cauilan

Karli Sipps

Jake Rempel

This textbook answer is only visible when subscribed! Please subscribe to view the answer

Chemistry

Stephanie Castillo

Allea Cauilan

Karli Sipps

Jake Rempel

Raymond Chang, Kenneth A. GoldsbyChemistry

Stephanie Castillo

Allea Cauilan

Karli Sipps

Jake Rempel

Raymond Chang, Kenneth A. Goldsby

Chemistry